Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles

Journal article
(Original article)

Publication Details

Author(s): Karg M, Rasch M, Schmidt K, Spitzer S, Schlaug D, Karsten TF, Biaciu CR, Gorunov A, Schmidt M
Journal: Nanomaterials
Publication year: 2018
Volume: 8
Journal issue: 10
Pages range: 862
ISSN: 2079-4991
Language: English


Up to now, minimizing segregation of free-flowing, microscale metal powder mixtures
driven by different mass density is an open challenge. In this work, effects of particle size variation
on homogeneity of Al-Cu mixtures, with a density ratio of 3.3, are examined. Dry coating Al
particles with 0.3 wt% fumed silica SiOx nanoparticles significantly decreases interparticle attraction.
This enlarges the range of free-flowing Al particle sizes to < 20 m. Powder mixture homogeneity is
examined optically in vibrated bulk powder and thinly spread layers. From various powder mixtures,
solid samples are built layer by layer with the Additive Manufacturing (3D printing) technology
Laser Beam Melting in metal powder bed (LBM). Chemical homogeneity of solids is evaluated via
energy-dispersive X-ray spectroscopy, backscattered electron microscopy, metallographic analysis
and tensile tests. Persistent homogeneity of Al-Cu powder mixtures and LBM solids is found only
with particles < 20 m dry coated with SiOx nanoparticles. Observed segregation phenomena are
explained with a decrease in particle mobility at increasing local concentration and the decreasing
effectiveness of mass in smaller particles. The main effects are based on geometry, so they are expected
to be transferrable to other nanoparticles, alloying components and powder bed technologies,
e.g., binder jetting.

FAU Authors / FAU Editors

Karg, Michael
Sonderforschungsbereich 814/3 Additive Fertigung
Karsten, Till Felix
Lehrstuhl für Photonische Technologien
Rasch, Michael
Sonderforschungsbereich 814/3 Additive Fertigung
Schmidt, Michael Prof. Dr.-Ing.
Lehrstuhl für Photonische Technologien

How to cite

Karg, M., Rasch, M., Schmidt, K., Spitzer, S., Schlaug, D., Karsten, T.F.,... Schmidt, M. (2018). Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles. Nanomaterials, 8(10), 862.

Karg, Michael, et al. "Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles." Nanomaterials 8.10 (2018): 862.


Last updated on 2019-01-04 at 09:34